It's common to have a booking with multiple rates during the stay. This could be because you have set up different rate values for certain days to maximise yield.
Creating or editing a multi rate booking
Start by creating or editing your booking.
Go to the room that you would like to add another rate.
You can select Custom from the Rate dropdown or simply click Add another rate
Ensure that the total nights is equal to the duration of the stay.
Once you're done, click Save booking.
Note: Bookings with multiple rates from your channel manager will be created with the multiple rates as expected.